String creation in cosmologies with a varying dilaton |
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| Affiliation: | 1. Joseph Henry Laboratories, Princeton University, Princeton, NJ 08544, USA;2. Berkeley Center for Theoretical Physics and Department of Physics, University of California, Berkeley, CA 94720-7300, USA;3. Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, CA 94720-8162, USA;1. Institute of Theoretical Physics, Chabners University of Technology, S-412 96 Goteborg, Sweden;2. Faculty of Physics, P.O. Box 550, 11001 Belgrade, Yugoslavia |
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| Abstract: | FRW solutions of the string theory low-energy effective actions are described, yielding a dilaton which first decreases and then increases. We study string creation in these backgrounds and find an exponential divergence due to an initial space-like singularity. We conjecture that this singularity may be removed by the effects of back-reaction, leading to a solution which at early times is de Sitter space. |
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